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ME40 HW9 Solutions

# ME40 HW9 Solutions - 11-19A refrigerator with...

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Unformatted text preview: 11-19A refrigerator with refrigerant-134a as the working fluid is considered. The rate of heat removal from the refrigerated space, the power input to the compressor, the isentropic efficiency of the compressor, and the COP of the refrigerator are to be determined. Assumptions1Steady operating conditions exist. 2Kinetic and potential energy changes are negligible. Analysis(a) From the refrigerant tables (Tables A-12 and A-13), ( )throttlingkJ/kg98.84kJ/kg98.84C24MPa65.kJ/kg16.281MPa7.kJ/kg53.288C50MPa7.KkJ/kg97236.kJ/[email protected]=≅==°======°==⋅==°-==°hhhhTPhssPhTPshTPfsssThen the rate of heat removal from the refrigerated space and the power input to the compressor are determined from and ( ) ( )( )( ) ( )( )kW5.06kW19.4=-=-==-=-=kJ/kg246.36288.53kg/s0.12kJ/kg84.98246.36kg/s0.1212in41hhmWhhmQL&&&&(b) The isentropic efficiency of the compressor is determined from 82.5%=--=--=36.24653.28836.24616.2811212hhhhsCη(c) The COP of the refrigerator is determined from its definition,...
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ME40 HW9 Solutions - 11-19A refrigerator with...

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